Most babies are conceived on December 11 - scientists say the colder air helps
to improve sperm quality; one report says couples simply have sex more in
the run up to Christmas.

National birth records show the most popular birthday is September 16th, making December 11 the most popular date for conceiving babies.

While scientists suggest the colder air helps to improve sperm quality, one website and seller of sex-toys, Lovehoney, says people are more likely to have sex more often in December due to the festive season.

Lovehoney co-founder Neal Slateford said he was expecting a boom in sales ahead of today, December 11, adding that a lot of "broody couples will be staying in and having a good time" this evening after work.

The sex toys retailer also said December was generally a busy period for the site, because of the Christmas party season and wind-down to the new year.